Learn all about Percolation Test, Perk Test, Perc Test, Soil Test, Soil Test Kits and more. The percolation test is designed to determine the suitability of a site for a subsurface private sewage disposal system (i.e. septic system). More specifically, a percolation test measures the ability of the soil to absorb liquid. Septic system designers use the results of percolation tests to properly...